pozzuoli, the super active volcano of the campi flegrei. the solfatara is the only visible mouth with its fumaroles

geology cliff wall mountain rock wadi valley coast fortification waterway badlands sea transport tourism trail ridge village pozzuoli super active campi flegrei solfatara mouth city suffers volcano visible fumaroles fumarole sulfuric mineral vapor hot bradyism active mystery heat clouds mountains crater fog hydrothermal pozzuoli thermal volcanic phenomena fumaroles solfatara volcano valley eruption flegrei rock ecosystem caldera national park wildlife nature volcanic geyser hiking steam geothermal mountain tourism outdoor water sky italy naples sulfur beautiful bison orange barren palpitation